'Regex Tester lets you test regular expressions against text instantly. It helps developers validate patterns, inspect matches, experiment with flags, and debug search logic for validation, parsing, and text processing tasks.', 'howto' => [ 'Enter a regular expression pattern in the pattern field.', 'Optionally add flags such as g, i, or m.', 'Paste your test text into the input box.', 'Click Test Regex to see matches and match count instantly.', 'Review the results and copy or refine your pattern as needed.' ], 'why' => 'Regex Tester helps developers build and debug regular expressions faster. It is useful for text validation, search rules, pattern matching, content extraction, and form input testing during development.', 'faq' => [ [ 'q' => 'What does Regex Tester do?', 'a' => 'Regex Tester checks how a regular expression pattern matches against your input text and shows the results instantly.' ], [ 'q' => 'Can I use regex flags like g or i?', 'a' => 'Yes. You can enter standard JavaScript regex flags such as g, i, and m.' ], [ 'q' => 'Does it show all matches?', 'a' => 'Yes. If you use the global flag, the tool will list all matches found in the text.' ], [ 'q' => 'Is Regex Tester free to use?', 'a' => 'Yes. You can use this online tool for free.' ] ] ]; include_once $_SERVER['DOCUMENT_ROOT'] . '/inc/tools/related-tools-helper.php'; $relatedTools = getAutoRelatedTools($toolSlug, $toolCategory, 5); include_once $_SERVER['DOCUMENT_ROOT'] . "/inc/header.html"; ?>

Free Online Developer Tools

Format, validate, encode, decode, and inspect developer data instantly.
Developer Tools

Regex Tester

Test regular expressions against text and inspect matches instantly.

Enter pattern and text

Results

Status Ready
Pattern -
Flags -
Input length 0
Match count 0
Unique matches 0
Output lines 0
Error -
Regex Result
Waiting for input